These are New Check / Thread Take Up Spring # 55645 ) that fits the following Models.15-30,15-86

SINGER MODELS - 

(1)Singer Thread Tension Check Spring for: 15-30,15-86

#55645

Plus 

(1)Round Motor Belt 13/15" Stretch

(1)Bobbin Winder Ring

(1)Metal Spool Pin with Red Felt